Hydraulic jack



' April 2o, 1937.

H. R. ROSENBERRY ET AL HYDRAULIC JACK original Filed Ju 1y le, lm. 2 sheets-sheet 1 INvENrcRe 2 .Sheets-Sheet 2 April 20, 1937 H. R. RosENBERRY E-r Al.

HYDRAULIC- JACK Original Filed July 16, 1931.

Patented Apr. 20, 1937 UNITED STATES ao'laz'os masonic Jacx Homer B.. Roaenberry and Bay P. Rosenbry, Cleveland Ohio, asignen to Carl W. Brand.

Cleveland. h10

Application July 16. 1931, Serial No. 551,196 Renewed December 20, 1934 This invention relates to hydraulic jacks, and the principal object of the invention is to provide a new and improved device of thischaracter.

In the drawings accompanying this specification and forming a part of this application; we have shown, for purposes of illustration, one form which our invention may assume, and in these drawings:

Figure 1 is a. side elevational view of an embodiment of the invention,

Figure 2 is an enlarged vertical sectional view of the construction shown in Figure 1,

Figure 3 is a horizontal sectional view corresponding substantially to the line 3-3 of Figure 2, v 4

Figure 4 is a fragmentary vertical sectional view corresponding substantially to the line 4-4 of `Figure 3,

Figure 5 is a fragmentary vertical sectional view corresponding substantially to the line 5-5 of Figure 2, f

Figure 6 is a fragmentary horizontal sectional view illustrating a modified form of our invention, while Figure 7 is a view similar to Figure 6,but illustrating a still further modified form of our invention.

The embodiment of the invention herein disclosed comprises an elongated base l0 from which.

rises a ram cylinder il and a reservoir i2, cast integrally with the base I0 and with each other, and having an integrally cast handle I3, the cylinder il at its upper end having an interiorly threaded enlargement I4, and at its bottom having a threaded opening closed by a threaded plug i5 having a head i6 fitting in a counterbore l1; and the cylinder il and reservoir |2 communicate at their lower ends through a port i8, controlled by a needle valve I9, and adjacent their upper ends communicate through a port 20.

Reciprocably mounted in the cylinder is a tubular ram 2| extending through a ring 22 threaded into the threaded portion of the enlargement 14, extending also through a second ring 23 having threaded engagement with the ring 22, and suitable packing being interposed between the rings 22 and 23. 'Ihe ram 2| is interiorly threaded at its lower end for the threaded reception of the plug 24 against which bears a packing member 25 held in place by a plate 26 secured in position by screw bolt 21, and the upper end of the ram 2| is also interiorly threaded for the threaded reception of a threaded plug 28, operable to secure to the ram 2| a seat member |00, provided with a lateral extension 29 carrying a downwardly disposed rack member 30 having atongue and groove slidable bearing 3| between its inner surface and adjacent portion of the outer wall of the cylinder 00 provided along its sides with groove 32 for the slidable and pivotable reception of pins 33 threaded into the fui-cations 34 of a seat member 35 having a projection 33 adapted to adjustably engage any one of the rack-teeth 31 disposed along the rack member 3|).

One end portion of the casting is enlarged to provide a hollow projection 3B, interiorly threaded, as at 35, communicating with 'a bore 40 in the adjacent portion oi the casting; and the bore 4|) communicates with a pair of branch bores extending through the casting and constituting pump cylinders 4| and 42, the cylinder 4| communicating with a vertically extending duct 43 leading to the interior of the reservoir l2, having a valve seat for the accommodation of a ball valve 44 held normally closed by a spring 45 bearing upon a supporting plug 46, also communicating with an angularly extending duct 41 having a valve seat for the accommodation of a ball valve 48 held in place by a spring 49 supported by a plug 50, the duct 41 communicating with the lower end of the cylinder through a transverse ductv 5|. The cylinder 42 communicates with a vertically extending duct 52 leading to the interior of the reservoir I2, having a valve like the ball valve 44, an angularly extending duct 53 having a ball valve 54, and a transverse duct 55 leading to the interior of the cylinder l, similar t0 those already described in detail.

Slidably mounted in the cylinder 4| is a piston member 56, its inner end provided with an inverted cup-Shaped packing member 51, secured to the end of the piston member 56 by a screw 58. The outer end of the piston member 56 is integrally connected with a cylinder segment 59 working in the bore 40, and provided with a pair of studs lill for engagement with a pair of closed cam grooves 6| provided in a cylinder cam 62, and the cylinder 42 is provided with a piston member 63 similar to the piston member 56, .and having integrally formed therewith a cylinder segment 64 also working in the bore 4|! at a point diametrically opposite the cylinder segment 59, and provided with a pair of pins @35 for engagement with the closed cam grooves 6i at a point diametrically opposite the ypins 60, the cylinder segments 59' and 64 being positioned to travel in opposite directions when the cylinder cani 62 is rotated. The cylinder cam 62 at its inner end slots 14 formed in a socket portion 16 of an operating handle 16. In operation, with the parts in the position as shown in Figure 3, the handle 16 is manipulated to rotate the cylinder cam 62, drawing the piston member 56 therewith, thus creating a partial vacuum in the cylinder 43, unseating the valve 44 and illling the cylinder y43 and duct 41 with fluid, the'piston member 63 simultaneously traveling 1o inwardly and driving fluid previously withdrawn from the reservoir in the manner described in connection with the piston member 56 in advance thereof, unseating the valve 54 and discharging the fluid through the duct 55 into the lower end of the cylinder H. By reason of the fact that the cam grooves 6| are closed or continuous, the continued rotation of the cylinder cam 62, in which the grooves 6| are formed, in either direction will impart reciprocatory motion 20 to the plungers 56 and 63, and these plungers will alternately withdraw fluid from the reservoir and force the same into the cylinder 2| beneath the piston 25. This alternate action of the plungers 66 and 63 causes fluid to be forced into the ram cylinder 2| continuously as long as the cylinder cam 62 is rotated. It will be noted in this connection, that by thus employing acylinder cam provided with a closed cam groove, the cylinder c am may be rotated lcontinuously in either direction to eect a continuous delivery of iluid under pressure to the ram cylinder. Moreover, this effect may be obtained by oscillating the cam cylinder 62 without making a complete rotation of the same. In Figure 6 of the drawings we have shown the cylinder cam 62 as being provided with but a single closed cam groove 98, which is engaged at diametrically opposed points by pins 16 provided with anti-friction rollers 11. In other respects, o the construction shown in Figure 6 is substantially the same as that described in connection with the preceding figures.

In Figure 7 we have shown a still further modiiied form of our invention, in which We employ but 5 a single plunger 18 provided with a suitable packing 19 at its inner end, and which is mounted for reciprocation within a cylinder 80 communicating at its inner end with a vertical passage 8| opening into the lower portion of the reservoir l2, 50 and with a horizontally extending passage 82 communicating with the interior of the ram cylinder 2| through a passage 83. Backward iiow of fluid from the ram cylinder is prevented by means of a ball valve 84 held in engagement with a valve seat 85 adjacent the outer end of the passage 82 by a spring 86. The outer end of the plunger 18 has integrally formed therewith a cylinder cam 81, and this cam and plunger is prevented from rotating by means of a pin 88 carried by the o plunger 18 for engagement with a longitudinally extending groove 89 formed in the wall of the cylinder 80. Surrounding the cylinder v.cam 81 is a rotatable sleeve 90 provided with an inwardly extending pin 9| for engagement with asingle closed cam groove 92 provided ingthe cylinder cam 81. 'I'he outer end of the sleeve 98 bears against cooperating race-ways 93 having ball bearings 84 disposed therebetween, and these race-Ways are carried by a screw-threaded cup 95 which is threaded into the threaded extension 38 of the main casting. A suitable packing 96 is contained 1ithin the extension 38, and is held in position by a screw-threaded ring 91 which is also threaded into the extension 38. 'I'he sleeve 98 is provided with a shaft 99 which extends outwardly through the packing 96 and ring 91 and means by which the sleeve 98 may be rotated. In this particular construction, .when the sleeve 98 is rotated, a reciprocatory motion is imparted to the cylinder cam 81 and the plunger 18, which causes fluid to be withdrawn from the reservoir I2 and forced into the ram cylinder through the passages 8|, 82, and 83, in a manner hereinbefore described in connection with the structure shown in the preceding iigures.

It will be understood by those skilled in the art that the embodiment herein disclosed accomplishes at least the principal object of the invention, that it has uses and advantages other than those herein particularly referred to, and that various changes and modifications may be made without departing from the spirit of the invention, and accordingly, the embodiment disclosed herein is illustrative only, and the invention is not limited thereto.

We claim:

1. A hydraulically operable jack, comprising: a casting providing a reservoir and ram cylinder, and having a normally closed valve controlled passage to effect exhaust of fluid from said ram cylinder to said reservoir; a ram in said ram cylinder; a pump cylinder communicating through ducts in said casting with said ram cylinder and with said reservoir; valve means in said ducts operable to permit one way passage of fluid from said reservoir to said ram cylinder; a piston member in said pump cylinder, movement of which operates said valves; a projecting base portion of said casting; an anti-friction bearing disposed in said projecting portion of said casting; an operating member extending to the exterior of said jack, and rotatably carried by said anti-friction bearing; and cam means extending continuously around one of said members, and a projection carried by the other of said members and engaging said cam means, whereby rotation of said operating member eilects reciprocation in opposite directions of said piston member, to thus operate said ram.

2. A hydraulically operable'jack, comprising: a casting providing a. reservoir and ram cylinder,

and having a normally closed Valve controlledA passage to effect exhaust of fluid from said ram cylinder to said reservoir; a ram in said ram cylinder; a plurality of pump cylinders each communicating through ducts in said casting with said ram cylinder and with said reservoir; valve means in said ducts operable to permit one way passage of uid from said reservoir to said ram cylinder; a piston member in each of said pump cylinders, movement of which operates said valves; a projecting base portion of said casting; a cup-shaped receptacle threaded into said projecting portion of said casting and containing cooperating raceways having anti-friction bearings therebetween; an operating member extending to the exterior of said jack, and rotatably carried by said cooperating race-ways; and cam means extending continuously around said operating member, and a projection carried by each of said piston members and engaging said cam means, whereby rotation of said operating member effects reciprocation in opposite directions of said piston members to 

